From 8e77b3f8c97cd29b96c8e3600712db0b155eaf02 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 12 Apr 2019 13:51:38 +0200
Subject: [PATCH] [C64] CIA: act on flag_n fully (pseudo)asynchronously

---
 cores/c64/rtl/mos6526.v | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cores/c64/rtl/mos6526.v b/cores/c64/rtl/mos6526.v
index 3543490..0131d4f 100644
--- a/cores/c64/rtl/mos6526.v
+++ b/cores/c64/rtl/mos6526.v
@@ -155,11 +155,11 @@ end
 always @(posedge clk) begin
   if (!res_n) icr[4] <= 1'b0;
   else begin
-    if (!flag_n && flag_n_prev) icr[4] <= 1'b1;
     if (phi2_p) begin
-      flag_n_prev <= flag_n;
       if (int_reset) icr[4] <= 1'b0;
     end
+    flag_n_prev <= flag_n;
+    if (!flag_n && flag_n_prev) icr[4] <= 1'b1;
   end
 end